Method of manufacturing ceramic porous membrane and method of manufacturing ceramic filter

Abstract

There are disclosed a method of manufacturing a thin and uniform ceramic porous membrane formed with less membrane formation times and having less defects, and a method of manufacturing a ceramic filter including the ceramic porous membrane. A UF membrane having an average pore diameter smaller than that of a porous base member is formed on the porous base member, a ceramic sol is deposited on the UF membrane, and the ceramic sol is dried with blown air and then fired to form a ceramic porous membrane having an average pore diameter smaller than that of the UF membrane.

1 . A method of manufacturing a ceramic porous membrane, comprising: depositing a ceramic sol on the surface of a base member; drying the ceramic sol; and then firing the base member having the ceramic sol to form the ceramic porous membrane on the base member, wherein air is blown along the surface of the base member having the deposited ceramic sol thereon while the air is brought into contact with the surface of the base member, to dry the ceramic sol.  
     
     
         2 . A method of manufacturing a ceramic porous membrane, comprising: depositing a ceramic sol on the surface of a base member; drying the ceramic sol; and then firing the base member having the ceramic sol to form the ceramic porous membrane on the base member, wherein the ceramic sol is applied to the surface of the base member, allowed to drop down owing to a weight of the ceramic sol itself, and discharged from the surface of the base member, and the ceramic sol which is not discharged is deposited on the surface of the base member.  
     
     
         3 . The method of manufacturing the ceramic porous membrane according to  claim 2 , wherein air is blown along the surface of the base member having the deposited ceramic sol thereon while the air is brought into contact with the surface of the base member, to dry the ceramic sol.  
     
     
         4 . The method of manufacturing the ceramic porous membrane according to  claim 1 , wherein a solvent of the ceramic sol includes 50 wt % or more of ethanol.  
     
     
         5 . The method of manufacturing the ceramic porous membrane according to  claim 2 , wherein a solvent of the ceramic sol includes 50 wt % or more of ethanol.  
     
     
         6 . The method of manufacturing the ceramic porous membrane according to  claim 1 , wherein an average pore diameter of an outermost surface layer of the base member is in a range of 0.5 to 20 nm.  
     
     
         7 . The method of manufacturing the ceramic porous membrane according to  claim 2 , wherein an average pore diameter of an outermost surface layer of the base member is in a range of 0.5 to 20 nm.  
     
     
         8 . The method of manufacturing the ceramic porous membrane according to  claim 1 , wherein a component of the ceramic sol is silica.  
     
     
         9 . The method of manufacturing the ceramic porous membrane according to  claim 2 , wherein a component of the ceramic sol is silica.  
     
     
         10 . A method of manufacturing a ceramic filter, comprising: depositing a ceramic sol on the surface of a base member; drying the ceramic sol; and then firing the base member having the ceramic sol to form the ceramic porous membrane on the base member, wherein air is blown along the surface of the base member having the deposited ceramic sol thereon while the air is brought into contact with the surface of the base member, to dry the ceramic sol.  
     
     
         11 . A method of manufacturing a ceramic filter, comprising: depositing a ceramic sol on the surface of a base member; drying the ceramic sol; and then firing the base member having the ceramic sol to form a ceramic porous membrane on the base member, wherein the ceramic sol is applied to the surface of the base member, allowed to drop down owing to a weight of the ceramic sol itself, and discharged from the surface of the base member, and the ceramic sol which is not discharged is deposited on the surface of the base member.  
     
     
         12 . The method of manufacturing the ceramic filter according to  claim 11 , wherein air is blown along the surface of the base member having the deposited ceramic sol thereon while the air is brought into contact with the surface of the base member, to dry the ceramic sol.  
     
     
         13 . The method of manufacturing the ceramic filter according to  claim 10 , wherein a solvent of the ceramic sol includes 50 wt % or more of ethanol.  
     
     
         14 . The method of manufacturing the ceramic filter according to  claim 11 , wherein a solvent of the ceramic sol includes 50 wt % or more of ethanol.  
     
     
         15 . The method of manufacturing the ceramic filter according to  claim 10 , wherein an average pore diameter of an outermost surface layer of the base member is in a range of 0.5 to 20 nm.  
     
     
         16 . The method of manufacturing the ceramic filter according to  claim 11 , wherein an average pore diameter of an outermost surface layer of the base member is in a range of 0.5 to 20 nm.  
     
     
         17 . The method of manufacturing the ceramic filter according to  claim 10 , wherein a component of the ceramic sol is silica.  
     
     
         18 . The method of manufacturing the ceramic filter according to  claim 11 , wherein a component of the ceramic sol is silica.